OWC has a new TB expansion box "coming soon", the Helios 2
TB 2.0 to go with the new Mac Pro.
It would be better if it were three, but two isn't bad and $500 is doable. I'm looking for external expansion and this seems like a good option.

- Two Thunderbolt ports
- Expansion slots: (2) PCIe 2.0 x8 (x4 mode)
- Up to 20Gb/s data transfer
- Daisy-chain up to six devices
- One-year warranty
TB 2.0 to go with the new Mac Pro.
It would be better if it were three, but two isn't bad and $500 is doable. I'm looking for external expansion and this seems like a good option.